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Organization and Basis of Presentation (Tables) | 12 Months Ended
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Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Summary of Subsidiaries VIEs and VIEs' Subsidiaries | As of December 31, 2019, details of the Company’s subsidiaries, its VIEs and VIEs’ subsidiaries were as follows:
Name (1) |  | Date of establishment/ acquisition |  | Place of establishment |  | Percentage of direct or indirect economic ownership |  |  | Principal activities
Subsidiaries: |  |  |  |  |  |  |  |  |  |
Sunlands HK |  | October 6, 2015 |  | HongKong |  | 100% |  |  | Investment holding
Wuhan Zhibo |  | August 2, 2017 |  | PRC |  | 100% |  |  | Provision of technical consultation and services
Tianjin Sunlands |  | July 31, 2017 |  | PRC |  | 100% |  |  | Provision of technical consultation and services
Wuhan Shangde Online Education Technology Co., Ltd. |  | June 25, 2019 |  | PRC |  | 100% |  |  | Provision of education services
Chengdu Xinketang Cultural Communication Co., Ltd. |  | November 4, 2019 |  | PRC |  | 100% |  |  | Sales of educational materials and books
Variable interest entities ("VIEs"): |  |  |  |  |  |  |  |  |  |
Beijing Sunlands |  | September 27, 2013 |  | PRC |  | N/A* |  |  | Investment holding and provision of education services
Tianjin Shangde |  | March 21, 2018 |  | PRC |  | N/A* |  |  | Provision of education services
VIEs’ subsidiaries: |  |  |  |  |  |  |  |  |  |
Beijing Shangzhi Jiaye Education Technology Co., Ltd. |  | March 13, 2012 |  | PRC |  | 100% |  |  | Provision of education services
Beijing Shangren Chongye Education Technology Co., Ltd. |  | September 27, 2013 |  | PRC |  | 100% |  |  | Provision of education services
Guangdong Shangde Online Education Technology Co., Ltd. |  | October 15, 2013 |  | PRC |  | 100% |  |  | Provision of education services
Guangzhou Youhe Self-study Training School |  | May 19, 2015 |  | PRC |  | 100% |  |  | Provision of education services
Beijing Heikuaima Education Technology Co., Ltd. (2) |  | March 3, 2016 |  | PRC |  | 100% |  |  | Provision of education services
Shanghai Shangchi Education Technology Co., Ltd. |  | December 22, 2016 |  | PRC |  | 90% |  |  | Provision of education services
Shanghai Shangchi Institute |  | September 1, 2017 |  | PRC |  | 100% |  |  | Provision of education services
Guangzhou Shangzhi Side Education Technology Co., Ltd. |  | September 28, 2017 |  | PRC |  | 100% |  |  | Provision of education services
* These entities are controlled by the Company pursuant to the contractual agreements disclosed below.
| (1) | The English names are for identification purpose only.
| (2) | The entity changed its legal name from Beijing Bainiao Education Technology Co., Ltd. to Beijing Heikuaima Education Technology Co., Ltd. in July 2019.
Summary Financial Information of VIEs and their Subsidiaries | The following financial information of the VIEs and their subsidiaries as of December 31, 2018 and 2019 and for each of the three years in the period ended December 31, 2019 was included in the accompanying consolidated financial statements after elimination of intercompany transactions and balances within the subsidiaries, VIEs and their subsidiaries:
|  | As of December 31, |
|  | 2018 |  |  | 2019 |
|  | RMB |  |  | RMB |
Cash and cash equivalents |  |  | 80,371 |  |  |  | 69,539 |
Short-term investments |  |  | 587,051 |  |  |  | 38,990 |
Prepaid expenses and other current assets |  |  | 46,601 |  |  |  | 106,568 |
Total current assets |  |  | 818,480 |  |  |  | 284,887 |
Right-of-use assets |  |  | — |  |  |  | 340,302 |
Total non-current assets |  |  | 377,856 |  |  |  | 776,783 |
Total assets |  |  | 1,196,336 |  |  |  | 1,061,670 |
Accrued expenses and other current liabilities |  |  | 241,204 |  |  |  | 209,727 |
Deferred revenue, current |  |  | 1,765,085 |  |  |  | 1,162,938 |
Lease liabilities, current |  |  | — |  |  |  | 22,659 |
Total current liabilities |  |  | 2,006,289 |  |  |  | 1,395,324 |
Deferred revenue, non-current |  |  | 1,520,940 |  |  |  | 1,096,482 |
Lease liabilities, non-current |  |  | — |  |  |  | 358,467 |
Total liabilities |  |  | 3,527,364 |  |  |  | 2,854,823 |
|  | Years ended December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | RMB |  |  | RMB |  |  | RMB |
Net revenues |  |  | 970,162 |  |  |  | 1,973,985 |  |  |  | 2,049,461 |
Net (loss)/income |  |  | (606,946 | ) |  |  | 393,063 |  |  |  | 590,728 |
Net cash generated from/(used in) operating activities |  |  | 845,616 |  |  |  | 1,448,005 |  |  |  | (480,084 | )
Net cash (used in)/generated from investing activities |  |  | (375,802 | ) |  |  | (315,198 | ) |  |  | 522,104 |
Net cash (used in)/generated from financing activities |  |  | (391,237 | ) |  |  | 8,018 |  |  |  | — |

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